Office chair



FIG. 1 is a front view of an office chair incorporating a design of the present disclosure;

FIG. 2 is a back view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof; and,

FIG. 7 is a stereogram view thereof. 

CLAIM The ornamental design for an office chair, as shown. 